Nestor Guillen Olmos (1890-1966) was President of Bolivia for 27 days between July and August 1946, following the overthrow and assassination of President Gualberto Villarroel (1943-46).
Born in La Paz, Guillen studied law and rose to become second from the top in the La Paz Court of Appeals. Upon the death of Villarroel, the confluence of forces that had toppled him needed a reliable caretaker with as few partisan credentials to guide the country to elections. They settled on the head of the La Paz Court of Appeals, Tomas Monje Gutierrez, who was ill at the time. Thus, Guillen filled-in for him for fewer than 4 weeks, whereupon Monje was sworn-in.
Nestor Guillen then returned to his judgeship and died in 1966.
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